ECOLOGICAL CHEMICAL METHOD FOR PREPARATION OF A ZINCATE ELECTROLYTE FOR ELECTRODEPOSITION OF LOW-ALLOYED Zn-Fe ALLOYS
DOI:
https://doi.org/10.59957/jctm.v61.i3.2026.8Keywords:
Ecological method, chemical dissolution, non-toxic zincate electrolyte, Zn-Fe alloy, chronopotentiometry.Abstract
An ecological chemical method was developed to obtain a non-toxic zincate electrolyte for the electrodeposition of low-alloy Zn-Fe (< 1 wt. % Fe) alloys. The self-dissolution parameters of zinc in 120 g L-1 NaOH from alternative sources - self-dissolution rate (V) and full removal time (tfrc), were compared for three zinc sources: hot-dip galvanized steel (A-Zn), galvanic industry waste (B-Zn), and battery waste (C-Zn). Optimal conditions for the dissolution of zinc from A-Zn were selected: concentration of the activating additive hydrogen peroxide (50 mL L-1 50 % H2O2), temperature (50 - 55°C), and solution saturation time (10 - 15 min). A procedure is proposed for the preparation of the final alkaline zincate electrolyte for deposition of low-alloy Zn-Fe (< 1 wt. % Fe) alloys, including preparation of basic solutions of the primary ions-zinc from chemical dissolution of A-Zn and an alkaline iron concentrate derived from spent hydrochloric pickling solutions for carbon steel, containing two Fe-complexing ligands. By controlling the solution composition and the reflectivity of the Zn-Fe coatings, a design for an alkaline zincate electrolyte has been proposed, enabling the production of high-quality alloys.
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